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The most common cause of high blood calcium is primary hyperparathyroidism, which results in overproduction of parathyroid hormone by the parathyroid glands. The parathyroid glands play a role in the bodyâs regulation of calcium levels in the blood.he most common cause of high blood calcium is primary hyperparathyroidism, which results in overproduction of parathyroid hormone by the parathyroid glands. The parathyroid glands play a role in the bodyâs regulation of calcium levels in the blood.
In adults, too much calcium (from dietary supplements but not food) might increase the risk of kidney stones. Some studies show that people who consume high amounts of calcium might have increased risks of prostate cancer and heart disease, but more research is needed to understand these possible links. The upper limits for calcium are listed below.